2S2 GARDEN FOES. 



spring. They are all covered with a i)o\\dery or cottony 

 secretion. 



Kemedies. — Spraying with a Soap and Quassia (No. 14) 

 or a Kerosene Emulsion (No. 16) seems to be the most 

 effective remedy. Where the trees are small, dusting 

 with powdery lime has proved efficacious. 



Larg:e Larch Sawfly (Nematus Erichsoni). — The 

 larvjc of this sawtfy has wrought considerable injury 

 among the larch forests on the Continent, and in 1906 

 they were found in immense numbers in larch plantations 

 in Cumberland. In this case they entirely defoliated 

 most of the trees. The parent sawfly is about §in. in 

 length, has glossy wings and a dark body. The fully- 

 grown larva is about fin. in length, has a black, hairy 

 head, greyish-green body on top, and yellowish - green 

 beneath- The " (?ggs are hud in one or two rows on 

 the youngest larch shoots, and in slits in the bark made 

 by the saws of the females." The larv?e winter in 

 cocoons, pupate about May, and appear as sawflies in 

 June. The feeding period is from June to September. 



Anyone finding caterpillars feeding on larch should 

 forward specimens to the Board of Agriculture inspector 

 at once, in compliance with the terms of the Order pub- 

 lished on p. 314. 



Nun or Black Arches Moth (Liparis monacha). 

 —A near relative of the Gipsy Moth. The fore wings of 

 this moth are white patterned with black; the hind ones 

 are greyish, and the abdomen of a red tint. The larvae, 

 which appear from April to July, are yellowish-creamy 

 \\ hite, mai-bled with black. There are four tubercles on each 

 segment, each having a tuft of hair. The liead is large 

 and speckled. A voracious ])est, feeding on the a])ple, 

 oak, and other forest trees with great avidity" and inflict- 

 ing serious injury in some seasons. Both species should 

 be reported, as advised in Chapter V., when discovered. 



